Kerberos uses configuration files to allow administrators to specify
settings on a per-machine basis. krb5.conf applies to all
applications using the Kerboros library, on clients and servers.
For KDC-specific applications, additional settings can be specified in
kdc.conf; the two files are merged into a configuration profile
used by applications accessing the KDC database directly. kadm5.acl
is also only used on the KDC, it controls permissions for modifying the
KDC database.